11 Troubleshooting
Alarm codes
TCGB0136 rev.1 - 05/2021
121
11
Code
Category
Content of Abnormality
Leading Cause
31
System
Incorrect capacity setting of outdoor unit
and indoor unit
Incorrect capacity setting of outdoor unit and indoor unit,
excessive or insufficient indoor unit total capacity code
32
Incorrect setting of other indoor unit
number (RPK series only)
Problem with a different Indoor Unit in the same refrigerant
cycle; (Failure at the power supply, defective PCB)
35
Incorrect indoor unit number setting
Duplication of indoor unit number in same refrigerant cycle
number
36
Incorrect of indoor unit combination
Outdoor unit is R32 designed and there is at least one
indoor unti not supporting R32 refrigerant.
38
Abnormality of picking up circuit for
protection (outdoor unit)
Failure of protection detecting device (incorrect wiring of
outdoor PCB)
3A
Outdoor Unit
Abnormal outdoor unit capacity
Outdoor unit capacity > Permitted maximum
3b
Incorrect setting of outdoor unit models
combination or voltage
Incorrect setting of main and sub units(s) combination or
voltage
3d
Abnormal communication between main
unit and sub unit(s)
Incorrect wiring, disconnect wire, breaking wire, PCB failure
3E
Abnormal combination between inverter
PCB and outdoor PCB
Incorrect combination between inverter PCB and outdoor
PCB
43
Protection
Device
Activation of the protection device from
compression ratio decrease
Abnormal compression (failure of compressor or inverter,
loose power supply connection)
44
Activation of the protection device from
excessively high suction pressure
Overload during cooling, high temperature with heating,
locked expansion valve
45
Activation of the protection device from
excessively high discharge pressure
Overload (obstruction of Heat exchanger or clogging, short
circuit) mixture of inert gas
47
Activation of the protection device
from excessively low suction pressure
(protection from vacuum operation)
Shortage or leakage of refrigerant, piping clogging,
expansion valve close-locked, fan motor locked
48
Abnormality of current sensor for inverter
Overload operation, compressor failure, failure of DIP-IPM,
heat exchanger clogged, locked compressor, EVI/EVO
failure or overcharge
49
Outdoor Unit
Shortage of energy transfer at IDU and
ODU side
Shortage of refrigerant due to gas leakage
50
Compressor continuously in operation
under very low discharge pressure
Abnormality operation at a low ambient temperature
51
Sensor
Abnormality of current sensor for inverter
Current sensor failure
53
Inverter
Protection activation of inverter module
Driver IC error signal detection (inverter module abnormality,
protection for overcurrent, voltage decrease, short circuit),
instantaneous overcurrent. Failure of compressor, clogging
of heat exchanger
54
Inverter fin temperature increase
Abnormal inverter fin thermistor, clogging of heat exchanger,
abnormal outdoor fan.
55
Inverter Module abnormality
Failure of inverter module (PCB failure)
57
Fan Controller
Activation of fan controller protection
Driver IC error signal detection (protection for overcurrent,
voltage decrease, short circuit), instantaneous overcurrent,
disconnected wire or incorrect wiring between control PCB
and inverter PCB, incorrect wiring or fan motor abnormality.
88
Alarm for abnormality of fan or
compressor driver
The fan or the compressor driver do not transfer an
identification code
5A
Abnormal fan controller fin temperature
Fin thermistor fault, heat exchanger clogging, fan motor fault
5b
Activation of overcurrent protection
Fan motor failure
5C
Abnormality of fan controller sensor
Failure of current sensor (instantaneous overcurrent,
increase of fin temperature, low voltage, grand fault, step-
out)
A1
Indoor Unit
Active filter abnormality detection
Active filter abnormality
